package com.itheima.utils;

public class IDUtils {

        private static byte[] lock = new byte[0];

        // 位数，默认是8位
        private final static long w = 1000;

        public static String createID(String time) {
            long r = 0;
            synchronized (lock) {
                r = (long) ((Math.random() + 1) * w);
            }

            return time + String.valueOf(r).substring(1);
           // return System.currentTimeMillis() + String.valueOf(r).substring(1);
        }



}
